Increasingly photographers are turning to iPads as an alternative to printing paper portfolios or showing proof prints. Images nearly jump off the high-quality display and the benefits in terms of flexibility are obvious and substantial. But the iPad doesn’t offer any way to calibrate or profile its display — meaning there isn’t any built-in way to ensure accurate color. This has left most of us mumbling vague apologies in advance when about to show off our latest creations on an iPad or iPhone.